US20130091685A1 - Method of applying pre-tightening force on an anchor bolt - Google Patents

Method of applying pre-tightening force on an anchor bolt Download PDF

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Publication number
US20130091685A1
US20130091685A1 US13/652,074 US201213652074A US2013091685A1 US 20130091685 A1 US20130091685 A1 US 20130091685A1 US 201213652074 A US201213652074 A US 201213652074A US 2013091685 A1 US2013091685 A1 US 2013091685A1
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US
United States
Prior art keywords
tightening force
anchor bolt
applying
anchor
tensioner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/652,074
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English (en)
Inventor
Hongbing ZHU
Shuaiquan Zheng
LlANJIANG SONG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinovel Wind Group Co Ltd
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Sinovel Wind Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sinovel Wind Group Co Ltd filed Critical Sinovel Wind Group Co Ltd
Assigned to SINOVEL WIND GROUP CO., LTD reassignment SINOVEL WIND GROUP CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Song, Lianjiang, Zheng, Shuaiquan, ZHU, HONGBING
Publication of US20130091685A1 publication Critical patent/US20130091685A1/en
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/42—Foundations for poles, masts or chimneys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part

Definitions

  • the present invention relates to mechanical technology, and particularly to a method of applying a pre-tightening force on an anchor bolt.
  • the steel tower of wind turbine is generally fixed with embedded fasteners, taking the conventional embedded bolts for example, the tower is fixed as follows: part of an anchor bolt 1 is embedded in concrete 16 , the rest protrudes from the concrete 16 ; one end of the anchor bolt 1 in the concrete 16 is screwed on with a fixing nut 2 ; the part of the anchor bolt 1 protruding from the concrete 16 penetrates through a shimming flange 3 and a tower flange 4 from bottom to top after penetrating through the concrete 16 , then is screwed on with a fixing nut 5 , and the specific schematic diagram is as shown in FIG. 1 .
  • the axial force subjected to by an anchor bolt should be equal to a predetermined pre-tightening force.
  • a tensioner is used to pre-tighten the anchor bolts one by one.
  • the anchor bolts installed at the bottom of the tower generally are arranged in an inner ring and an outer ring, taking 96 anchor bolts in each of the rings for example, there are 192 anchor bolts in total.
  • the tensioner comprises a supporting bridge, a telescopic boom and a stretching head. In use, the supporting bridge is disposed on tower flange, and the stretching head and the top of the anchor bolt are fixed. The telescopic boom protrudes against the stretching head and drives the anchor bolt to stretch upwards.
  • the tensioner works powered by an oil pump.
  • the supporting bridge of tensioner is directly disposed on the tower flange, which is easy to damage paint on the surface of the tower flange and thus influences the quality and service life of the tower.
  • An object of the present invention is to provide a method of applying a pre-tightening force on an anchor bolt, aiming to optimize the conventional method of applying a pre-tightening force on an anchor bolt and improve performance of the tower.
  • One aspect of the present invention provides a method of applying a pre-tightening force on an anchor bolt, comprising:
  • the above method of applying a pre-tightening force on an anchor bolt preferably, before installing the washer with a predetermined dimension between the tower flange and the fastening nut for supporting the supporting bridge of the tensioner, further comprising:
  • the anchor bolts in each of the rings are equally divided into at least two groups, the number of the anchor bolts in each group is N, and N is a natural number.
  • the step of applying a pre-tightening force on anchor bolts in an inner ring and an outer ring installed on the tower flange comprises:
  • the step of numbering the anchor bolts in each of the rings comprises:
  • the number of the tensioners equals to the product of the number of groups of the anchor bolts in each of the rings and the number of the rings, and the tensioners used in each of the rings are connected in series.
  • the step of recording the serial number of each anchor bolt comprises:
  • a length of the anchor bolt clamped by a stretching head of the tensioner is no less than 1.5 times of the diameter of the anchor bolt.
  • the predetermined dimension of the washer is the radial dimension of the washer, which is greater than the radial dimension of the supporting bridge of the tensioner.
  • the method of applying a pre-tightening force on an anchor bolt adopts a washer with a predetermined dimension to replace the conventional washer, such that the tensioner will not directly contact the surface of the tower flange, and the pressure of the tensioner is transmitted uniformly to the tower flange via the washer, avoiding damage to paint on the surface of the tower flange and improving installation quality and service life of the tower.
  • FIG. 1 is a partial installation schematic diagram of the tower in the prior art
  • FIG. 2 a is a flow schematic diagram of the method of applying a pre-tightening force on an anchor bolt according to Embodiment 1 of the present invention
  • FIG. 2 b is an installation schematic diagram of the tensioner according to Embodiment 1 of the present invention.
  • FIG. 3 a is a flow schematic diagram of the method of applying a pre-tightening force on an anchor bolt according to Embodiment 2 of the present invention
  • FIG. 3 b is a schematic diagram of numbering the anchor bolts according to Embodiment 2 of the present invention.
  • FIG. 3 c is a schematic diagram of the tensioners in series according to Embodiment 2 of the present invention.
  • Embodiment 1 of the present invention provides a method of applying a pre-tightening force on an anchor bolt, the method is typically suitable for pre-tightening anchor bolts on wind turbine generator system (WTGS) as shown in FIG. 1 , the flow schematic diagram of the method is shown in FIG. 2 a , and the installation schematic diagram of the tensioner is shown in FIG. 2 b .
  • the method comprises the following steps:
  • Step 110 installing a washer 7 with a predetermined dimension between a tower flange 9 and a fastening nut, wherein the washer 7 is configured to support a supporting bridge 61 of a tensioner 6 .
  • the dimension of the washer 7 can be greater than, less than or equal to the dimension of the supporting bridge 61 of the tensioner 6 , however, in order to reduce the pressure subjected to by the washer 7 , preferably, the predetermined dimension of the washer 7 is the radial dimension of the washer 7 , which is greater than the radial dimension of the supporting bridge 61 of the tensioner 6 .
  • the radial dimension of the washer is greater than the radial dimension of the supporting bridge of the tensioner, such that the supporting bridge of the tensioner can be disposed on the washer in a convenient way.
  • the washer should be as thick as possible, here, the thickness can be 15 mm-30 mm
  • selecting washer with greater width and thickness can also make the supporting surface of the tensioner's supporting bridge fully supported on the washer, the washer can transmit uniformly pressure of the tensioner to the tower flange, thus avoiding damage to paint on the surface of the tower flange and improving installation quality and service life of the tower.
  • a conventional tensioner can be used.
  • the washer 7 should be made of metal.
  • Step 120 applying a pre-tightening force on anchor bolts 8 arranged in an inner ring and in an outer ring installed on the tower flange 9 with the tensioners 6 .
  • the length of the anchor bolt 8 clamped by stretching head 62 of the tensioner 6 is no less than 1.5 times of the diameter of the anchor bolt 8 . In this way, the connection between the stretching head 62 and anchor bolt 8 is more reliable.
  • the installation schematic diagram of the tensioner is as shown in FIG. 2 b , when the tensioner 6 is used, the supporting bridge 61 of the tensioner 6 is disposed on the washer 7 , the tower flange 9 is under the washer 7 , the stretching head 62 of the tensioner 6 is fixed to the top portion of the anchor bolt 8 , a shifting ring 65 of the tensioner 6 surrounds the outside of a fastening nut (not shown), a telescopic boom 63 of the tensioner 6 protrudes when driven by an oil cylinder 64 , not only stretching the anchor bolt 8 , but also applying a pre-tightening force on the anchor bolt 8 .
  • the fastening nut can be rotated via the through-holes 651 .
  • the advantages of using the tensioner are that: the force applied by the tensioner 6 on the anchor bolt 8 is mainly axial force, since there is no torque, the anchor bolt 8 will not rotate due to torque, thereby avoiding damage to the concrete layer and influence on installation safety of the tower.
  • the method of applying a pre-tightening force on an anchor bolt adopts a washer with a predetermined dimension to replace the conventional washer, such that the tensioner will not directly contact the surface of the tower flange, avoiding damage to paint on the surface of the tower flange and improving installation quality and service life of the tower.
  • FIG. 3 a is a flow schematic diagram of the method of applying a pre-tightening force on an anchor bolt according to Embodiment 2 of the present invention.
  • Embodiment 2 of the present invention preferably, prior to Step 110 , further comprises the following steps:
  • Step 221 numbering anchor bolts 8 in each of the rings, and recording a serial number of each anchor bolt 8 , wherein, the anchor bolts 8 in each of the rings are equally divided into at least two groups, the number of the anchor bolts 8 in each group is N, and N is a natural number.
  • the schematic diagram of the numbered anchor bolts is as shown in FIG. 3 b .
  • anchor bolts are numbered before the tower is hoisted, and particularly, the numbering manner is as follows: numbering the anchor bolt right facing the tower door of the tower in each of the rings as “1”, and numbering successively all the anchor bolts in each of the rings in the clockwise direction.
  • Embodiments of the present invention take two rings of anchor bolts and 96 anchor bolts in each of the rings as an example. Numbering anchor bolts facilitates to record the working process, thus improving working efficiency and avoiding missing some anchor bolts or repeating operations on some anchor bolts.
  • marking the serial number on the anchor bolt with pigment, and the pigment should be those with strong adhesive force, not easy to fade and waterproof.
  • Step 120 comprises the following steps:
  • Step 222 according to the serial number, applying a pre-tightening force on the i-th anchor bolt 8 in each group simultaneously until all the anchor bolts 8 in each group have been applied with a pre-tightening force equal to about half of a predetermined value, wherein, 1 ⁇ i ⁇ N.
  • the anchor bolts in the inner ring with serial numbers of “1”, “33”, “65” and in the outer ring with serial numbers of “1”, “33”, “65” are applied simultaneously with a pre-tightening force equal to about half of the predetermined value; then the anchor bolts in the inner and outer rings with serial numbers of “2”, “34”, “66” are applied simultaneously with a pre-tightening force equal to about half of the predetermined value; likewise, until the anchor bolts in the inner and outer rings with serial numbers of “32”, “64”, “96” are applied simultaneously with a pre-tightening force equal to about half of the predetermined value.
  • the manner of simultaneously applying a pre-tightening force in each group can make the tower flange and shimming flange in close contact, eliminate partial gaps, improve fixing reliability of the tower and ensure the safety of the tower. Since the pre-tightening force cannot be applied on the anchor bolts with a torque spanner, by numbering the anchor bolts, the pre-tightening force can be applied according to the requirements so as to avoid skipping, missing, or repeating applying force to the anchor bolts and the like, and influencing installation quality of the tower. Furthermore, numbering the anchor bolts also facilitates the subsequent checking on the applied pre-tightening force on the bolts, when there are problems on the bolts, the crux of the problem can be found by reviewing the applying process according to the applying record.
  • Step 223 according to the serial number, applying a pre-tightening force on the i-th anchor bolt in each group simultaneously until all the anchor bolts in each group have been applied with a pre-tightening force of the predetermined value, wherein, 1 ⁇ i ⁇ N.
  • Step 223 has the same principles with Step 222 , and unnecessary details are not given here.
  • the operations of applying a pre-tightening force on an anchor bolt are divided into two steps, firstly, the anchor bolts are applied with a pre-tightening force equal to about half of the predetermined value, then the anchor bolts are applied with a pre-tightening force of the predetermined value, and such manner of applying force is more reasonable, preventing anchor bolts from being distorted due to being subjected to too much pre-tightening force at a time.
  • the number of tensioners 6 equals to the product of the number of groups of the anchor bolts 8 in each of the rings and the number of rings, and tensioners 6 used in each of the rings is connected in series.
  • the schematic diagram of the tensioners in series is as shown in FIG. 3 c , anchor bolts 8 in an inner ring and an outer ring are divided by tower wall 10 , and the relative position relationship of shimming flange 11 and tower flange 9 is as shown in FIG. 3 c .
  • Tensioners 6 are connected to an oil pump 13 via an oil pipe 12 .
  • anchor bolts 8 are divided into six groups, and the inner ring and the outer ring each has three groups, three tensioners 6 used in the inner ring are connected in series while three tensioners 6 used in the outer ring are connected in series. Since oil pipes of tensioners 6 have slight distortion when oil pressure in oil pipes rises, such distortion will reduce the rising speed of oil pressure and such influence becomes more significant as the pipeline becomes longer.
  • the tensioners 6 are connected by means of two-path series connection, that is, several tensioners 6 for tensioning anchor bolts 8 in the outer ring are connected in series in one group, while several tensioners 6 for tensioning anchor bolts 8 in the inner ring are connected in series in another group, and two paths of oil pipes are connected to oil pump 13 via a distributor.
  • two-path series connection that is, several tensioners 6 for tensioning anchor bolts 8 in the outer ring are connected in series in one group, while several tensioners 6 for tensioning anchor bolts 8 in the inner ring are connected in series in another group, and two paths of oil pipes are connected to oil pump 13 via a distributor.
  • the rest five oil pipes have a maximum length of approximately 1 ⁇ 3 of the tower perimeter.
  • Oil pump can be disposed on the ground outside the tower door, for convenience of observation and signal liaison of the operators.
  • Stretching bolts in this method needs seven workers, that is, six operators for tensioner and one operator for oil pump. In this way, the length of pipelines for connecting the tensioners is reduced, rising speed of pressure in oil pump is increased, working intensity of oil pump is reduced and working efficiency of tensioning anchor bolts is improved.
  • the pre-tightening force of anchor bolts should be checked one by one in half a year, one year and two years, the checking sequence for the pre-tightening force should also be done according to the numbering sequence of the bolts. Thereafter, a sample of 10% of the bolts is randomly selected for checking the pre-tightening force every year to make sure the bolts have no loss in the pre-tightening force. All the checking work should have written records for review.
  • the method of applying a pre-tightening force on an anchor bolt divides the anchor bolts into groups and applies a pre-tightening force on certain anchor bolt in each group simultaneously, effectively ensuring that each anchor bolt has been applied with a pre-tightening force. Furthermore, the pre-tightening force can be applied two times, firstly applying a pre-tightening force equal to about half of a predetermined value, and then applying a pre-tightening force of the predetermined value, thus avoiding gaps between the tower flange and the shimming flange and ensuring installation reliability of the tower.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Wind Motors (AREA)
  • Foundations (AREA)
  • Bridges Or Land Bridges (AREA)
US13/652,074 2011-10-17 2012-10-15 Method of applying pre-tightening force on an anchor bolt Abandoned US20130091685A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110313649.5 2011-10-17
CN201110313649.5A CN103042502B (zh) 2011-10-17 2011-10-17 地脚螺栓预紧力施加方法

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US13/652,074 Abandoned US20130091685A1 (en) 2011-10-17 2012-10-15 Method of applying pre-tightening force on an anchor bolt

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US (1) US20130091685A1 (zh)
EP (1) EP2584098A1 (zh)
CN (1) CN103042502B (zh)
AU (1) AU2012241154A1 (zh)
BR (1) BR102012026589A2 (zh)
CA (1) CA2792695A1 (zh)

Cited By (4)

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CN104596691A (zh) * 2014-11-24 2015-05-06 宝鸡石油机械有限责任公司 一种测试水下金属密封垫环预紧力的方法
US20150143765A1 (en) * 2012-02-28 2015-05-28 Ms Enertech, S.L. Connection between a wind turbine tower and its foundation
CN105485138A (zh) * 2014-10-09 2016-04-13 遵义遵宏螺杆厂 一种预紧螺栓组件
CN112432778A (zh) * 2020-11-20 2021-03-02 山东建筑大学 一种可施加预应力的锚杆相似模型装置及使用方法

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CN107039897A (zh) * 2017-06-20 2017-08-11 四川电力设计咨询有限责任公司 电气屏柜的安装结构及安装方法
CN111526968B (zh) * 2017-12-27 2022-04-29 纳布拉温德科技有限公司 用于控制螺栓预张紧的系统
CN110410398B (zh) * 2019-08-21 2024-08-27 中冶天工集团天津有限公司 一种地脚螺栓紧固装置及其使用方法
CN111719710A (zh) * 2020-06-01 2020-09-29 中国核工业华兴建设有限公司 一种核电站地脚锚栓成组张拉装置及方法
CN112091589B (zh) * 2020-09-18 2022-07-01 一重集团大连核电石化有限公司 大直径密集螺栓的紧固方法
CN112179556B (zh) * 2020-09-29 2024-09-10 核工业西南物理研究院 一种聚变堆螺栓组预紧检测装置及其预紧力检测方法
CN113441940B (zh) * 2021-06-30 2022-09-27 哈尔滨工业大学 沿螺栓轴向加载的压电换能器预紧装配装置及装配方法

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SU667639A1 (ru) * 1977-02-16 1979-06-15 Предприятие П/Я Г-4743 Анкер дл креплени элементов к основанию
JP2011071318A (ja) * 2009-09-25 2011-04-07 Daihen Corp 電力用機器固定装置
WO2011079973A2 (en) * 2009-12-18 2011-07-07 Siemens Aktiengesellschaft Method of construction of a tower of a wind turbine and tower
CN101831917B (zh) * 2010-04-06 2011-08-10 武汉钢铁(集团)公司 大型精密设备安装中垫板的安装施工方法
CN102095052B (zh) * 2010-11-25 2013-06-12 华锐风电科技(集团)股份有限公司 地脚螺栓锚固系统的安装方法及安装工业设备的方法
CN201934860U (zh) * 2011-02-25 2011-08-17 杨立新 一种承受交变重载的回转设备地脚螺栓

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150143765A1 (en) * 2012-02-28 2015-05-28 Ms Enertech, S.L. Connection between a wind turbine tower and its foundation
CN105485138A (zh) * 2014-10-09 2016-04-13 遵义遵宏螺杆厂 一种预紧螺栓组件
CN104596691A (zh) * 2014-11-24 2015-05-06 宝鸡石油机械有限责任公司 一种测试水下金属密封垫环预紧力的方法
CN112432778A (zh) * 2020-11-20 2021-03-02 山东建筑大学 一种可施加预应力的锚杆相似模型装置及使用方法

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AU2012241154A1 (en) 2013-05-02
CN103042502B (zh) 2015-05-13
CN103042502A (zh) 2013-04-17
BR102012026589A2 (pt) 2013-10-29
CA2792695A1 (en) 2013-04-17
EP2584098A1 (en) 2013-04-24

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AS Assignment

Owner name: SINOVEL WIND GROUP CO., LTD, CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZHU, HONGBING;ZHENG, SHUAIQUAN;SONG, LIANJIANG;REEL/FRAME:029160/0092

Effective date: 20121015

STCB Information on status: application discontinuation

Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION